flywheel

[pbillyi69]

what are the pros and cons of using a flywheel that has the magnent for heated handlebars? the magnent ads a little weight does it limit or have any influence at all on rpms say on a ported saw where you would be trying to make more rpm? im just curious what people think and what saw builders opinions are? i would think that not having the extra weight would be better but maybe it helps? i dont know.

 

[Funky sawman]

Good topic, as an avid user of heated handles, I often wonder the same. More inertia from the magnets means the saw is more likely to hold rpm a little better. I'm not saying more torque, just more stable rpm.

 

[pbillyi69]

that's what I'm wondering exactly

 

[Stevetheboatguy]

Probably not exactly the same on a saw. But we found out years ago that the snowmobiles with ring gears on the clutch. Would last almost twice as long between rebuilding. And the clutches would hold up even better. We figured it cut down on the harmonics. 25-30yr later they now have a smooth ring bolted to the back of the clutch on almost all two strokes. Even though 90% now have electric start standard. But dont get me on that soapbox of the pussification!

Back to the op's question. It probably helps more in a dampening aspect than anything. Not enough mass to really help or hurt the spool up or holding of torque. I didn't feel a difference in my 372 without heart to the one with. Would need dyno Joe aka @Red97 to work up some charts.


Steven

 

[mrxlh]

Mass equates to torque. Moose made many different weighted flywheels for dirt bikes back years ago. It won’t spin up as fast, but also wont lose inertia as easily either. Probably the best example of how it works are hit and miss early oilfield engines with massive weighted flywheels. They would only fuel/fire every 14-16 revolutions? The massive flywheels kept them running.

 

[jacob j.]

I know when I was building hybrid 044/046s - I preferred the early, heavier 044 flywheel for the hybrid.

The kart guys for years were shaving 101 flywheels - it helped them in the curves where acceleration is the key, but they lost revs on the straights.

So a lot of them went back to running stock flywheels at the big tracks and saved the shaved flywheels for the smaller, tighter tracks.

 

[pbillyi69]

another question i have wondered is does one or the other have better fuel efficiency.